In a large mixing bowl, combine the ground beef, minced garlic, chopped green onions, breadcrumbs, egg, soy sauce, and grated ginger. Shape into small meatballs.
Preheat your oven to 400°F (200°C). Heat a frying pan, add oil, and brown the meatballs on all sides.
Transfer the meatballs to a baking sheet and bake for 10-15 minutes until fully cooked.
In a saucepan, combine soy sauce, brown sugar, cornstarch, and water, whisking until smooth. Cook over medium heat until thickened, then add sesame oil.
Toss the meatballs in sauce until well-coated, then serve hot.
Notes
Store leftover meatballs in an airtight container in the refrigerator for up to 4 days, or freeze for up to 3 months for longer storage.